. >> i love michele obama. i love her. >> reporter: some had tears in their eyes as mrs. obama spoke passionately about her husband. >> i have seen firsthand that being president doesn't change who you are. no, it reveals who you are. >> reporter: she says this president is a man whose upbringing and family values means he'll look out for all americans. >> whether it comes to rebuilding our economy, barack obama is thinking about folks like my dad and like his grandmother. that's why he cuts taxes for working families and small businesses and fought to get the auto industry back on its feet. >> reporter: while the first lady stayed mostly away from politics, keynote speaker julian castro dove right in. he got the crowd here fired up when he answered the question are we better off today than we were four years ago. >> four years ago america stood on the brink of a depression in spite incredible odds and united republican opposition, our president took action and now we've seen 4.5 million new jobs. >> reporter: